Yahoo! has done an amazing job of advancing ARIA here, by exercising ARIA's full capabilities and sharing their techniques. Yahoo! Search uses a combination of ARIA landmarks, live regions, and widgets.

Like the W3C WAI-ARIA specification, the official best practices represents a future ideal — a day when authors can rely on consistent ARIA support across browsers and screen readers. The W3C documents provide an in-depth view of ARIA.

For now, web developers implementing ARIA should maximize compatibility. Use best practices docs and examples based on current implementations.

The community needs a complete set of WCAG techniques for WAI-ARIA + HTML, so that organizations can be comfortable claiming their ARIA-enabled content is WCAG compliant. This is important when regulations or policies are based on WCAG.